The best is probably Banded Pipefish or Blue Stripe Pipefish or Multibanded Yellow Pipefish but I'm pretty sure Alligator Pipefish and Jann's Pipefish can be kept in high flow too.
Courtesy of LiveAquaria:
"The Banded Pipefish is a type of reef pipefish or flagtail pipefish. This fish is a stronger swimmer than its seahorse cousins and rarely comes into direct contact with the substrate. In the wild, the Banded Pipefish can be found swimming under rocky overhangs, corals, or close to the floor of its reef habitat."
"The Bluestripe Pipefish is the smallest of the reef pipefishes available in the aquarium hobby. It has a long, slender body with a tiny, tubular mouth and a round, flag-like tail. The body is orange with a blue stripe on either side running from snout to tail. The tail is maroon to red with highly variable yellow, orange, and white markings.
Bluestripe pipefish are among the hardiest pipefish, but are difficult to keep due to their small size and unusual requirements. "
"The Yellow Multibanded Pipefish is a type of reef pipefish or flagtail pipefish. This fish is a stronger swimmer than its seahorse cousins and rarely comes into direct contact with the substrate. In the wild, the Yellow Multibanded Pipefish can be found swimming under rocky overhangs, corals, or close to the floor of its reef habitat.
"The Janss' Pipefish is a type of reef pipefish or flagtail pipefish. This fish is a stronger swimmer than its seahorse cousins and rarely comes into direct contact with the substrate. In the wild, the Janss' Pipefish can be found swimming under rocky overhangs, corals, or close to the floor of its reef habitat where it performs the role of cleaner fish and often feed on parasites and dead tissue from damsels and cardinalfish. The Janss' Pipefish may also clean other types of fish in the aquarium."
"The Dragonface Pipefish is also called the Reeftop Pipefish. The Dragonface Pipefish is a poor swimmer and prefers to travel by sliding its body over substrate and live rock similar to the way a snake moves. The Dragonface Pipefish can also use its tail to loosely anchor itself to corals or rocks.
Thank you LA.
